Shortlist by what you need
Start here if you know why you are leaving OpenAI Codex.
Want the closest match?
OpenCodeMost similar to OpenAI Codex in what it does, its category and its price.
Visit (opens OpenCode in a new tab)Need a free plan?
OpenHandsHas a free plan, rated 5.0 out of 5. OpenAI Codex has none.
Visit (opens OpenHands in a new tab)Want the best rated?
Claude CodeRated 4.6 out of 5 in our review, against 4.4 for OpenAI Codex.
Visit (opens Claude Code in a new tab)
At a glance
Green means better than OpenAI Codex, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 OpenAI CodexBaseline | 4.4 | $20/mo | No | A 2025 relaunch of a 2021 name, now a fully autonomous agent | |
| OpenCode | 4.3−0.1 | Free | YesOpenAI Codex has none | One of the most-starred open-source coding agents, works with existing subscriptions | vs OpenAI Codex |
| Claude Code | 4.6+0.2 | $20/moSame price | No | Anthropic's agentic CLI tool for real software development work | vs OpenAI Codex |
| OpenHands | 5.0+0.6 | $20/moSame price | YesOpenAI Codex has none | An open-source, research-rooted alternative to closed autonomous agents | vs OpenAI Codex |
 Cognition AI | 4.1−0.3 | $20/moSame price | YesOpenAI Codex has none | Cognition AI built Devin, an autonomous coding agent that plans, writes, tests, and ships code inside a sandboxed development environment. | vs OpenAI Codex |
 Gemini CLI | 4.3−0.1 | Free | YesOpenAI Codex has none | Google's free, open-source answer to terminal coding agents | vs OpenAI Codex |
 Google Jules | 4.2−0.2 | Free | YesOpenAI Codex has none | Assign it a GitHub issue, it works in the background and opens a PR | vs OpenAI Codex |
 Aider | 4.6+0.2 | Free | YesOpenAI Codex has none | A terminal-based pair programmer that commits its own changes | vs OpenAI Codex |
 Devin | 4.0−0.4 | $20/moSame price | No | Marketed as the first AI software engineer, with disputed early claims | vs OpenAI Codex |
The alternatives in detail
In order of how closely each one matches OpenAI Codex.
OpenCode
4.3Free
vs OpenAI Codex−0.1Free plan
One of the most-starred open-source coding agents, works with existing subscriptions.
- Open source across terminal, IDE, and desktop app
- 160,000+ GitHub stars and 7.5 million+ monthly developers
- Can use existing GitHub Copilot or ChatGPT Plus/Pro subscriptions
Very large, active community and contributor base
Scale and rapid growth mean documentation and stability can lag new feature releases
Claude Code
4.6$20/mo
vs OpenAI CodexSame price+0.2
Anthropic's agentic CLI tool for real software development work.
- Terminal-native agent with direct codebase and shell access
- Multi-file, coordinated code changes in one session
- Runs tests and reads output as part of task completion
Direct shell and codebase access supports genuinely complex, multi-step tasks
No free tier, requires a paid Claude subscription or API access
OpenHands
5.0$20/mo
vs OpenAI CodexSame price+0.6Free plan
An open-source, research-rooted alternative to closed autonomous agents.
- Open-source autonomous coding agent architecture
- Sandboxed execution environment for safe, reproducible runs
- Originally released as OpenDevin before rebranding
Fully open architecture supports inspection, modification, and self-hosting
Self-hosting requires real infrastructure setup and maintenance
Cognition AI
4.1$20/mo
vs OpenAI CodexSame price−0.3Free plan
Cognition AI built Devin, an autonomous coding agent that plans, writes, tests, and ships code inside a sandboxed development environment.
- Autonomous planning, coding, testing, and PR creation from a single ticket
- Sandboxed VM execution isolated from a team's live environment
- Integration with existing code repositories and developer tools
Handles full ticket-to-PR workflows, beyond inline code suggestions
ACU-based pricing makes real monthly cost hard to predict in advance
Gemini CLI
4.3Free
vs OpenAI Codex−0.1Free plan
Google's free, open-source answer to terminal coding agents.
- Open-source, terminal-native coding agent
- Built on Google's Gemini models
- Direct codebase, file, and shell access
Free access with notably generous usage limits
Newer product with a shorter track record than established terminal agents
Google Jules
4.2Free
vs OpenAI Codex−0.2Free plan
Assign it a GitHub issue, it works in the background and opens a PR.
- Asynchronous background task execution
- Works directly from GitHub issues
- Opens pull requests automatically when tasks complete
Async workflow fits clearing a backlog without constant supervision
Less suited to tasks needing real-time back-and-forth guidance
Aider
4.6Free
vs OpenAI Codex+0.2Free plan
A terminal-based pair programmer that commits its own changes.
- Terminal-based, no IDE required
- Automatic git commits with generated messages
- Model-agnostic, works with many different LLM providers
Automatic git commits keep a clean, reviewable change history
No graphical interface, requires comfort with the command line
Devin
4.0$20/mo
vs OpenAI CodexSame price−0.4
Marketed as the first AI software engineer, with disputed early claims.
- Fully autonomous multi-step task planning and execution
- Plans, codes, tests, and debugs within one session
- Marketed as one of the earliest autonomous AI software engineers
Ambitious scope for autonomous, end-to-end task completion
Original launch benchmark claims were publicly disputed by independent researchers
FAQ
Questions people ask
Is OpenAI Codex free?
OpenAI Codex does not list a free plan. Paid plans start from $20/mo.
What is the best free alternative to OpenAI Codex?
OpenHands is the highest-rated alternative here with a free plan (5.0 out of 5). Other free options: Aider, OpenCode, Gemini CLI.
What is the cheapest alternative to OpenAI Codex?
Among paid plans, Claude Code has the lowest starting price (from $20/mo). If you need it free, start with OpenHands.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.